- 26th Street Woods
- 63rd St. Beach Dunes
- Adeline Jay Geo-Karis Illinois Beach State Park
- Afton Forest Preserve
- Alden-Sedge Meadow Conservation Area
- Alfred Caldwell Lily Pool
- Algonquin Woods Preserve
- Alice L. Kibbe Life Science Research Station
- Allison Woods
- Allison Woods Preserve
- Almon Underwood Prairie Forest Preserve
- Almond Marsh Forest Preserve
- Altorfer Tract
- American Beech Woods Nature Preserve
- Amôwa Forest Preserve
- Andersen Woods Forest Preserve
- Anna Page Park
- Apple River Canyon State Park
- Argyle Lake State Park
- Arie Crown Forest
- Arlene Shoemaker Forest Preserve
- Army Trail Nature Center
- Aurora West Forest Preserve
- Axehead Lake
- Bachelor's Grove Woods
- Baker Woods Forest Preserve
- Baker's Lake
- Baker's Lake Nature Preserve
- Bald Hill Prairie Preserve
- Bald Knob Wilderness
- Ballard Nature Center
- Banks/Young Wildlife Preserve
- Banner Marsh
- Banner Marsh Fish and Wildlife Area
- Barbara Brown Nature Reserve
- Barnes Forest Preserve
- Barnhart Prairie Restoration
- Barrens
- Barrington Bog Nature Preserve
- Bartel Grassland Land and Water Reserve
- Bartlett Prairie & Wetland
- Bartlett Woods Nature Preserve
- Bates Fen Nature Preserve
- Bay Creek Wilderness
- Beach Prairie Preserve
- Beall Woods Nature Preserve
- Beall Woods State Park
- Beaubien Woods
- Beaver Bluff Conservation Area
- Beaver Dam State Park
- Beaver Island
- Beck Lake
- Beck's Wood
- Bell Smith Springs Recreation Area
- Belleau Lake
- Belleau Lake Preserve
- Belleau Wood Preserve
- Belleau Woods Forest Preserve
- Belmont Prairie Nature Preserve
- Bemis Woods North
- Bemis Woods South
- Bennett's Terraqueous Gardens
- Berkeley Prairie
- Big Bend Lake Preserve;Big Bend Lake
- Big Bend State Conservation Area
- Big Island River Conservancy
- Big River State Forest
- Big Rock Forest Preserve
- Big Woods County Forest Preserve
- Bill Jarvis Migratory Bird Sanctuary
- Binnie Forest Preserve
- Birchwood Park
- Bird & Butterfly Sanctuary
- Black Crown Marsh State Natural Area
- Black Hawk Forest Nature Preserve
- Black Partridge Park
- Black Partridge Woods
- Black Partridge Woods Nature Preserve
- Black Walnut Creek Preserve
- Blackberry Creek Forest Preserve
- Blackberry Creek South F.P.
- Blackberry Maples Forest Preserve
- Blackhawk Springs Forest Preserve
- Blackmon Wildlife Preserve
- Blackthorn Hill Nature Preserve
- Blackwell Campground
- Blackwell Forest Preserve
- Bliss Woods Forest Preserve
- Blue Raider Park
- Blue Star Memorial Woods
- Blue Star Memorial Woods Preserve
- Bluff Spring Fen
- Bobolink Meadow
- Boger Bog Conservation Area
- Bohm Woods Nature Preserve
- Bois du Sangamon Nature Preserve
- Bolcum Road Wetlands Forest Preserve
- Boloria Meadows
- Bonnies Prairie Nature Preserve
- Boone Creek Conservation Area
- Bowes Creek Greenway
- Bowes Creek Woods Forest Preserve
- Boyds Hollow Woods
- Bradford State Habitat Area
- Braeburn Marsh Forest Preserve
- Braidwood Dunes and Savanna Nature Reserve
- Brewster Creek Forest Preserve
- Brezina Woods
- Brookdale Conservation Area
- Brookfield Woods Preserve
- Brownell Woods
- Brownfield Woods
- Brunner Family Forest Preserve
- Buehler Preserve
- Buena Park
- Buffalo Creek Forest Preserve
- Buffalo Park Forest Preserve
- Buffalo Prairie State Fish and Wildlife Area
- Buffalo Rock State Park
- Buffalo Trace Prairie
- Buffalo Woods
- Bunker Hill
- Bunker Hill
- Burden Falls Wilderness
- Burlington Park Forest Preserve
- Burlington Prairie Forest Preserve
- Burnham Nature Sanctuary
- Burnham Prairie
- Burnham Wildlife Corridor
- Burnidge Forest Preserve
- Burning Star State Fish and Wildlife Area
- Busey Woods
- Busse Forest Nature Preserve
- Busse Lake Boating Center Grove
- Butterfield Creek Headwaters Land and Water Reserve
- Bystricky Prairie
- Cache River State Natural Area
- Cahokia Flatwoods Forest Preserve
- Cahokia Mounds State Historic Site
- Calamus Lake Nature Preserve
- Caldwell Preserves
- Caldwell Woods
- California Park Natural Area
- Callahan Grove
- Callahan Grove Preserve
- Calumet City Prairie Nature Preserve
- Calumet Woods
- Calvin and Sophia Ferguson Forest Preserve
- Calvin R. Sutker Grove
- Camp Hutchins
- Camp Pine Woods
- Camp Pine Woods Preserve
- Camp Shabbona Woods
- Camp Tomo-Chi-Chi Knolls Forest Preserve
- Camp Wokanda
- Campground Road Woods
- Campground Road Woods Preserve
- Campton Forest Preserve
- Canal Origins Park Natural Area
- Cannonball Sedgemeadow Forest Preserve
- Canton Lake
- Canton Youth Acres
- Cap Sauers Holding Nature Preserve
- Cape Bend State Fish and Wildlife Area
- Cardinal Creek Forest Preserve
- Carl N. Becker Savanna Nature Preserve
- Carl R. Hanson Woods
- Carolyn Goetz Wetlands Preserve
- Carpenter Park
- Carruthers Nature Preserve
- Cary Junior High Prairie Nature Preserve
- Casper Bluff Land and Water Reserve
- Castle Rock State Park
- Catherine Chevalier Woods
- Catherine Chevalier Woods Preserve
- Cave In Rock State Park
- Cedar Creek Conservation Area
- Cedar Glen State Natural Area
- Cermak Woods
- Chain O'Lakes State Park
- Chautauqua Bottoms
- Chautauqua National Wildlife Refuge
- Chautauqua National Wildlife Refuge - Billsbach Unit
- Chautauqua National Wildlife Refuge - Cameron Unit
- Che-Che-Pin-Qua Woods
- Chicago Portage National Historic Site
- Chicago Ridge Prairie Nature Preserve
- Chief Shabbona Forest Preserve
- Chilicothe Bottoms
- Chinquapin Bluffs Land and Water Reserve
- Chipilly Woods
- Chippewa Woods
- Churchill Prairie Nature Preserve
- Churchill Woods Forest Preserve
- Churchill Woods Glacial Ridge Forest Preserve
- City Line Ravine
- Clara Dietz Bird Sanctuary
- Clark Street Beach Bird Sanctuary
- Clayton Andrews Forest Preserve
- Clear Springs Wilderness
- Coal Hollow Park
- Cold Springs Park
- Colored Sands Forest Preserve
- Columbia Woods
- COMLARA Park
- Concannon Conservation Area
- Conservation Corridor
- Cooper Park
- Coral Woods Conservation Area
- Cotton Creek Marsh Nature Preserve
- Crabtree Preserve
- Cranberry Slough Nature Preserve
- Crawford County State Fish and Wildlife Area
- Creighton Woods Park
- Crevecoeur Nature Preserve
- Cricket Creek County Forest Preserve
- Crooked Creek Woods
- Crow Island Woods
- Crow Valley Campground
- Cuba Marsh Forest Preserve
- Culver Forest Preserve
- Cypress Creek National Wildlife Refuge
- Dam No. 1 Woods-East
- Dam No. 1 Woods-West
- Dam No. 4 Woods-East
- Dam Number 1 Woods Preserve
- Dam Number 2 Woods
- Dam Number 4 North Preserve
- Dam Number 4 South Preserve
- Dan Ryan Woods
- Danada Forest Preserve
- Dayton Bluffs Preserve
- Deer Grove Forest Preserve
- Deer Grove Forest Preserve - East
- Deer Grove Forest Preserve - West
- Deer Grove West Forest Preserve
- Deer Run Forest Preserve
- Derwen Mawr Nature Preserve
- Des Plaines State Fish and Wildlife Area
- Dewey Helmick Nature Preserve Addition to Old Plank Road Prairie Nature Preserve Buffer
- Dick Young Forest Preserve
- Dickenson Site
- Diversey Natural Area
- Dixie Briggs Forest Preserve
- Dixon Springs State Park
- Donnelley State Fish and Wildlife Area
- Doris Westfall Prairie Restoration Nature Preserve
- Double Branch Hole
- Double T State Fish & Wildlife Area
- Douglas E Wade Prairie
- Douglas Hart Nature Center
- Dr. Frank & Aagot Green Wildlife Sanctuary
- Dropseed Prairie Nature Preserve
- Dublin Highlands State Habitat Area
- Duck Farm Forest Preserve
- Dufield Pond Conservation Area
- Dunham Forest Preserve
- Dunning Read Natural Area
- Dutch Gap Forest Preserve
- Dwyer Woods
- E Dora Bohm Memorial Nature Preserve
- Eagle Creek State Park
- Eagle's Nest Land and Water Preserve
- East Branch Forest Preserve
- Eaton Preserve
- Ed Meagher Greenway
- Edgebrook Woods
- Edna Edwards Burnett Land and Water Reserve
- Edward L Ryerson Conservation Area
- Eggermann Woods Forest Preserve
- Eggers Grove
- Eisenmayer Sand Prairie Natural Heritage Landmark
- Elburn Forest Preserve
- Eldon Hazlet State Park
- Elgin Shores Forest Preserve
- Elizabeth A. Conkey Forest
- Elizabeth Lake Nature Preserve
- Elkhorn Creek Biodiversity Preserve
- Elliot Woods Park
- Ellison Creek Prairie
- Ellynwood Nature Preserve
- Elmwood Dunes Preserve
- Elton E Fawks Bald Eagle Refuge Nature Preserve
- Elwood Wildlife Preserve
- Emily Oaks Nature Center
- Emiquon National Wildlife Refuge
- Emiquon Preserve
- Erickson Woods
- Espenscheid Forest Preserve
- Eugene Field Natural Area
- Evans Field
- Everett Farm Nature Preserve
- Everett McKinley Dirksen Park
- Fabyan Forest Preserve
- Falcon Ridge Park
- Far Field Preserve
- Farmdale Reservoir Recreation Area
- Fel-Pro RRR Conservation Area
- Fel-Pro RRR Conservation Area
- Fern Rocks Nature Preserve
- Ferne Clyffe State Park
- Ferson Creek Fen Nature Preserve
- Fiddyment Creek Preserve
- Fischer Woods Forest Preserve
- Fisher Woods
- Fitchie Creek Forest Preserve
- Florsheim Park Nature Preserve
- Fondulac Reservoir
- Forest Glen County Preserve
- Forest Glen Seep Nature Preserve
- Forest Glen Woods
- Forest Glen Woods Preserve
- Forest Park
- Forest Park South
- Forest Preserve District of Cook County
- Forest Preserve District of Cook County
- Forest Preserve District of Cook County
- Forest Preserve District of Cook County
- Forest Preserve District of Cook County
- Forest Preserve District of Cook County
- Forest Preserve District of Cook County
- Forest Preserve District of Cook County
- Forest Preserve District of Cook County
- Forest Preserve District of Cook County
- Forest Preserve District of Cook County
- Forest Way Grove
- Forever Fields
- Forsythe Woods County Forest Preserve
- Fort Daniel Conservation Area
- Fort Massac State Park
- Fort Sheridan Forest Preserve
- Forty Acre Woods
- Foster Beach Dunes
- Fourth Lake Fen Forest Preserve
- Fourth Lake Forest Preserve
- Fox Bluff
- Fox Hollow Forest Preserve
- Fox Hollow Forest Preserve
- Fox Ridge State Park
- Fox River Bluff Forest Preserve
- Fox River Bluff West Forest Preserve
- Fox River Bluffs
- Fox River Forest Preserve
- Fox River Forested Fen Forest Preserve
- Fox River Islands
- Fox River Shores Forest Preserve
- Frank Bobrytzke Forest
- Franklin Addition
- Franklin Creek Headwaters
- Franklin Creek State Natural Area
- Fransen Nature Area
- Frazer Woods
- Freeman Forest Preserve
- Freeman Kame - Meagher Forest Preserve
- Freeport Prairie Nature Preserve
- Freeport Wetland Preserve
- Friends Creek Conservation Area
- Fullersburg Woods Forest Preserve
- Fullerton Park Forest Preserve
- Fullerton Woods
- Fullerton Woods Preserve
- Fults Hill Prairie Nature Preserve
- Funks Grove Nature Preserve
- G.A.R. Woods
- G.A.R. Woods Preserve
- Gander Mountain Forest Preserve
- Gar Creek Trail and Prairie Restoration
- Garden of the Gods Recreation Area
- Garfield Park Natural Area
- Gaslight Park Bird & Butterfly Sanctuary
- Gateway Wetlands
- Gavin Bog and Prairie
- Gaylord Wildlife Area
- Geneseo Prairie Park
- Gensburg - Markham Prairie Nature Preserve
- Geode Glen Park
- George B. Fell Nature Preserve
- Giant City State Park
- Gifford Pheasant Habitat Area
- Glacial Park Conservation Area
- Glen Oak County Forest Preserve
- Glen Oak Park
- Glenbrook North High School Prairie Nature Preserve
- Glenn Green Park
- Glenview Woods
- Glenwood Park Forest Preserve
- Glenwood Woods North
- Glenwood Woods South
- Golconda Marina State Recreation Area
- Gompers Park Lagoon
- Goodenow Grove Nature Preserve
- Goodrich Woods Forest Preserve
- Goose Lake Prairie State Natural Area
- Grainger Woods Conservation Preserve
- Grand Reserve Prairie
- Grant Creek Prairie Nature Preserve
- Grant Woods Forest Preserve
- Grassy Lake Forest Preserve
- Grassy Slough Preserve
- Green River State Wildlife Area
- Green Valley Camp
- Greenbelt Forest Preserve
- Greene Valley Forest Preserve
- Grigsby Prairie
- Griswold Conservation Area
- Grunwald Farms Forest Preserve
- Gunnar Anderson County Forest Preserve
- Gurgens Park
- Hackmatack National Wildlife Refuge
- Hadley Valley Preserve
- Half Day Forest Preserve
- Halsted Woods
- Hamilton County State Fish and Wildlife Area
- Hampshire Forest Preserve
- Hampshire South Forest Preserve
- Hank Gianvecchio Natural Habitat Area
- Hanley Savanna
- Hannaford Woods-Nickels Farm Forest Preserve
- Hanover Bluff State Natural Area
- Hanover Forest
- Harlem Hills Nature Preserve
- Harms Flatwoods Nature Preserve
- Harms Woods Nature Preserve
- Harms Woods Preserves
- Harms Woods-Central
- Harms Woods-North
- Harms Woods-South
- Harper's Woods Nature Preserve
- Harris Forest Preserve
- Harrison Benwell Conservation Area
- Harry "Babe" Woodyard State Natural Area
- Harry A. & Fanny B. Severson Dells Forest Preserve
- Harry Osterman Dunes
- Harry Semrow Preserve
- Hartman Hunting Club
- Hastings Lake Forest Preserve
- Hawk Hollow Forest Preserve
- Hawthorne Hills Nature Center
- Hayes Woods Preserve
- Hazelwood Forest Nature Preserve
- Hazelwood Park
- Hedge Apple Woods Nature Preserve
- Hegewisch Marsh
- Heidecke Lake State Fish and Wildlife Area
- Helm Woods Forest Preserve
- Henderson Creek State Wildlife Area
- Henneberry Forest Preserve
- Hennen Conservation Area
- Henry Eilers Nature Preserve
- Heritage Canyon Park
- Heron Creek Forest Preserve
- Heron Hill Rookery (Keep Out)
- Heron Pond
- Heron Pond – Little Black Slough Nature Preserve
- Heron Woods State Habitat Area
- Herrick Lake Forest Preserve
- Hibbard Woods Preserve
- Hickory Bottoms
- Hickory Creek Forest Preserve
- Hickory Creek Preserve
- Hickory Grove Forest Preserve
- Hickory Grove Riverfront
- Hickory Hills Woods
- Hickory Knolls Nature Preserve
- Hidden Acres
- Hidden Creek Nature Sanctuary
- Hidden Lake Forest Preserve
- Hidden Oaks Conservation Area
- Hidden Pond Woods
- Hidden Springs State Forest
- Higginbotham Woods
- High Point Conservation Area
- Highmoor Park Nature Preserve
- Hill Street Nature Center
- Hinchcliff Memorial Forest Preserve
- Hinkle Prairie Natural Heritage Landmark
- Historic Pullman Foundation Exhibit Hall
- Hitchcock Woods Forest Preserve
- Hitts Siding Prairie Nature Preserve
- Hollenback Sugarbush F.P.
- Hollis Park
- Holly Park
- Homer Lake Forest Preserve
- Hononegah Forest Preserve
- Hooper Branch Savanna Nature Preserve
- Hoover Forest Preserve
- Horizon Farm
- Horner Natural Area
- Horseshoe Bottom Nature Preserve
- Horseshoe Lake Conservation Area
- Horseshoe Lake State Fish and Wildlife Area
- Horseshoe Lake State Park
- Horseshoe Mound Preserve
- Hoscheit Woods Forest Preserve
- Howard Colman Hall Creek Preserve
- Howard D. Colman Dells Nature Preserve
- Howards Hollow Seep Nature Preserve
- Humboldt Park Natural Area
- Humiston Woods Nature Center
- Hunt Club Prairie Wetland
- Hunters Woods
- Huntley Marsh
- Hurd Tract
- Huyck's Grove Preserve
- Hybernia Nature Preserve
- Illini State Park
- Illinois Beach Nature Preserve
- Illinois Department of Natural Resources
- Illinois River State Fish and Wildlife Area
- Illinois State Nature Preserve
- Independence Grove
- Independence Park
- Indian Boundary Nature Play Center
- Indian Boundary Prairies
- Indian Gardens
- Indian Hill Forest Preserve
- Indian Hill Woods
- Indian Island
- Indian Road Woods Preserve
- Ipson Road Conservation Area
- Ira and Reatha T. Post Wildlife Sanctuary
- Irene C. Hernandez Family Picnic Grove
- Irish Oaks
- Iroquois County State Wildlife Area
- Iroquois Woods
- Iroquois Woods Nature Preserve
- Iroquois Woods Preserve
- Irving Park Road Canoe Landing
- Isle a la Cache County Forest Preserve
- Izaak Walton League of America Des Plaines Chapter 206
- Jack E. Cook Park and Forest Preserve
- Jack Wolf Memorial Fish Hatchery
- Jackson Creek Preserve
- Jackson Falls
- Jackson Hole Natural Area
- James "Pate" Philip State Park
- James S. Boan Woods
- James Woodworth Prairie Preserve (Peacock Prairie)
- Jane Addams Memorial Natural Area
- Jardine Bird Sanctuary
- Jay Woods Forest Preserve
- Jean and John Greene Nature Preserve
- Jelkes Creek Bird Sanctuary
- Jelkes Creek Forest Preserve
- Jerome Huppert Woods
- Jerome Huppert Woods Preserve
- Jim Edgar Panther Creek State Fish and Wildlife Area
- Joe Orr Woods
- John and Martha Ayers Science Field Station
- John E. Traeger Preserve
- John Husar I&M Canal
- John T McNaughton Park
- Johnson Creek Recreation Area
- Johnson Sauk Trail State Park
- Joliet Iron Works Historic Site
- Jon J. Duerr Forest Preserve
- Jubilee College State Park
- Jurgensen Woods
- Jurgensen Woods Nature Preserve
- Kankakee National Wildlife Refuge and Conservation Area
- Kankakee River State Park
- Kankakee Sands in Illinois
- Kankakee Sands Preserve
- Kaskaskia River State Fish and Wildlife Area
- Keepataw Reserve
- Kenneth L. Schroeder Wildlife Sanctuary
- Kennicott Grove
- Kennicott's Grove Nature Preserve
- Kent Fuller Air Station Prairie
- Kenyon Farm Forest Preserve
- Kenyon-Baller Woods Preserve
- Kestrel Ridge Forest Preserve
- Kickapoo Creek Recreation Area
- Kickapoo Park
- Kickapoo State Recreation Area
- Kickapoo Woods
- Kidd Lake State Natural Area
- Kieselburg Forest Preserve
- Kilbuck Bluffs County Forest Preserve
- King's Grove
- Kingsbridge Arboretum
- Kingsbury Park District Nature Preserve
- Kingsley Prairie
- Kinsey Park
- Kishwaukee Fen Nature Preserve
- Kishwaukee Gorge North Forest Preserve
- Kishwaukee Gorge South Forest Preserve
- Kishwaukee Headwaters Conservation Area
- Kishwaukee River Forest Preserve
- Kishwaukee River State Fish and Wildlife Area
- Klehm Arboretum and Botanic Garden
- Kline Creek Farm
- Kloempken Prairie
- Kloempken Prairie Preserve
- Knute Olson Forest Preserve
- L & M Prairie Nature Heritage Landmark
- La Framboise Woods Preserve
- La Grange Park Woods
- La Rue Swamp Nature Preserve
- LaBagh Woods
- LaBagh Woods and Sauganash Prairie Preserves
- Ladd Arboretum
- Lake Avenue Woods - East
- Lake Avenue Woods Preserves
- Lake Avenue Woods-West
- Lake Carina Forest Preserve
- Lake Carina Forest Preserve
- Lake Chaminwood Preserve
- Lake Como State Natural Area
- Lake Depue State Fish and Wildlife Area
- Lake In The Hills Fen Nature Preserve
- Lake Le-Aqua-Na State Park
- Lake Murphysboro State Park
- Lake of the Woods Forest Preserve
- Lake Renwick Preserve - Copley Nature Park
- Lake Run Forest Preserve
- Lakeland Park
- Lakeview Nature Area
- Lakewood Forest Preserve
- Lambs Woods
- Lansing Woods
- Laona Heights Forest Preserve
- Laona Heights Nature Preserve
- Legion Park Natural Area
- Leroy Oakes East Forest Preserve
- Leroy Oaks Forest Preserve
- Les Arends County Forest Preserve
- Leslie Rutherford Park
- LeSuer Nature Preserve
- Letcher Basin Land and Water Reserve
- Levi and Esther Fuller Memorial Forest Preserve
- Lexington Preserve
- Liberty Prairie Nature Preserve
- Library Springs Natural Area
- Lily Cache Greenway
- Lincoln Marsh Natural Area
- Lincoln Trail Homestead State Park
- Lincoln Trail State Park
- Lind-McGeachie Preserve
- Linne Woods
- Linne Woods Preserve
- Lions Woods
- Lions Woods Preserve
- Little Grand Canyon
- Little Rock Creek Forest Preserve
- Little Rock Creek State Natural Habitat
- Lockport Praire East Preserve
- Lockport Prairie Nature Preserve
- Lockwood Park
- Loda Cemetery Prairie Nature Preserve
- Loda Pheasant Habitat Area
- Lodge County Park
- Lone Grove Forest Preserve
- Loud Thunder Forest Preserve
- Lowden State Park
- Lowden-Miller State Forest
- Lowell Park
- Lower Cache River Access Area
- Lucky Seven Duck and Deer Inc
- Lusk Creek Canyon Nature Preserve
- Lusk Creek Wilderness
- Lyndon Prairie
- Lyon Forest Preserve
- Lyons Prairie and Marsh
- Lyons Woods Forest Preserve
- M.J. Rhymer Family Nature Preserve
- MacArthur Woods Forest Preserve
- Mackinaw River State Fish and Wildlife Area
- MacQueen Forest Preserve
- Mallard Lake Forest Preserve
- Manito Prairie Nature Preserve
- Manito State Habitat Area
- Maple Grove Forest Preserve
- Maramech Forest Preserve
- Marengo Ridge Conservation Area
- Margaret Guzy Pothole Wetlands State Natural Area
- Margery Adams Wildlife Sanctuary
- Marian R. Byrnes Park
- Markham Prairie - East Nature Preserve
- Marl Flat Forest Preserve
- Marovitz Savannah Natural Area
- Marshall State Fish and Wildlife Area
- Martha's Woods
- Massasauga Prairie Nature Preserve
- Matthiessen State Park
- Mautino State Fish and Wildlife Area
- Max and Edward Rose State Habitat Area
- Max McGraw Wildlife Foundation
- Mayslake Forest Preserve
- Maywood Grove
- Maywood Grove Preserve
- McClaughry Springs Woods
- McCormick Bird Sanctuary
- McCormick Woods Preserve
- McCune Sand Prairie
- McDonald Woods Forest Preserve
- McDowell Grove Forest Preserve
- McGinnis Slough
- McKinley Wood Forest Preserve
- McKiski Forest Preserve
- McMahon Woods & Fen Nature Preserve
- Meacham Grove Forest Preserve
- Meissner Prairie-Corron Forest Preserve
- Merdel/Ford Property
- Meredosia National Wildlife Refuge
- Mermet Lake State Fish and Wildlife Area
- Mermet Swamp Nature Preserve
- Merritt Prairie Forest Preserve
- Merwin Savannah Nature Preserve
- Messenger Woods Nature Preserve
- Messerling Wildlife Preserve
- Miami Woods
- Michael J. O'Malley Preserve
- Michael W. Wolff Memorial Wetlands
- Mickelson's Landing
- Middle Fork River Forest Preserve
- Middle Fork State Fish and Wildlife Area
- Middle Fork Woods Nature Preserve
- Middlefork Farm
- Middlefork Savanna Forest Preserve
- Midewin National Tallgrass Prairie
- Midlothian Meadows
- Milan Bottoms
- Mill Creek Forest Preserve
- Mill Creek Forest Preserve
- Mill Creek Greenway
- Mill Creek Natural Area
- Millbrook North Forest Preserve
- Millbrook South Forest Preserve
- Miller Meadow North
- Miller Meadow Preserve
- Miller Meadow South
- Miller Riverfront Park
- Miller-Anderson Woods State Natural Area
- Millington Forest Preserve
- Mirror Lake
- Mississippi Palisades State Park
- Mississippi River Sand Hills State Natural Area
- Mississippi Sanctuary/Olin Nature Preserve
- Mitchell Meadows
- Moeller Woods Preserve
- Moffet Woods
- Monee Reservoir
- Montrose Beach Dunes Natural Area
- Montrose Point Bird Sanctuary
- Moon Preserve
- Moraine Hills State Park
- Moraine View State Recreation Area
- Morton Arboretum
- Mouson Park
- Mskoda Land and Water Reserve
- Muirhead Springs Forest Preserve
- Mundsinger Woods
- Nachusa Grasslands
- National Grove Woods Preserve
- Nauvoo State Park
- Ned Brown Forest Preserve
- New Crystal Lake Club National Heritage Landmark
- Newark Forest Preserve
- Newton Lake State Fish and Wildlife Area
- Niabi Zoological Preserve
- Nipper Wildlife Sanctuary
- Nippersink Canoe Base County Park
- Nippersink Forest Preserve
- Norris Woods Nature Preserve
- North Branch Conservation Area
- North Dunes Nature Preserve
- North End Gun Club
- North Hart Road Grassland Natural Area
- North Park Prairie
- North Park Village Nature Center
- North Pond Nature Sanctuary
- North Salt Creek County Forest Preserve
- Northerly Island Natural Area
- Northfield Park District
- Northwestern Woods
- Northwestern Woods Preserve
- Noth Salt Creek Forest Preserve;North Salt Creek County Forest Preserve
- Nyman Farm Forest Preserve
- O'Hara Woods Nature Preserve
- Oak Forest Heritage Preserve
- Oak Ridge Forest Preserve
- Oak Ridge Marsh Nature Park
- Oak-Hickory Forest Preserve
- Oakdale Nature Preserve
- Oakhurst Forest Preserve
- Oakwood Hills Fen
- Old Plank Road Prairie Nature Preserve
- Old School Forest Preserve
- Oldfield Oaks Forest Preserve
- Openlands Lakeshore Preserve
- Openlands Lakeshore Preserve
- Oquawka State Wildlife Refuge
- Oriole Grove Forest Preserve
- Orland Grassland
- Orland Grassland South
- Osterman Beach Dunes Natural Area
- Ottawa Trail Woods North
- Ottawa Trail Woods South
- Otter Creek Bend Wetland Park
- Otter Creek Forest Preserve
- Ozark Hills Nature Preserve
- P. A. Nehring Forest Preserve
- Paddock Woods
- Paintbrush Prairie Nature Preserve
- Palos Fen Nature Preserve
- Palos Park Woods
- Palos Preserves
- Park No. 576
- Park No. 595
- Parker Fen Nature Preserve
- ParkLands Nature Preserve
- Paul Douglas Forest Preserve
- Paw Paw Woods Nature Preserve
- Pecatonica Prairie Trail
- Pecatonica River Forest Preserve
- Pecatonica Wetlands Forest Preserve
- Pederson Preserve
- Pekin Lake State Fish & Wildlife Area
- Pembroke Savanna Nature Preserve
- Perdueville Pheasant Habitat Area
- Pere Marquette State Park
- Perkins Woods Forest Preserve
- Perry Nature Preserve
- Pickerill-Pigott Forest Preserve
- Pine Dunes Forest Preserve
- Pine Hollow Ecoligical Area
- Pine Rock Nature Preserve
- Piney Creek Nature Preserve
- Piney Creek Ravine Nature Preserve
- Ping Tom Natural Area
- Pingree Grove Forest Preserve
- Pioneer Park Forest Preserve
- Plank Road Meadow
- Pleasant Valley
- Plum Creek Forest Preserve
- Plum Creek Natural Area
- Plum Grove Nature Preserve
- Plum Valley Preserve
- Plum Valley Ravines
- Poag Sand Prairie
- Poplar Creek Forest Preserve
- Poplar Creek Forest Preserve
- Portwine Preserve
- Possum Hollow Woods
- Potawatomi Woods
- Potawatomi Woods Preserve
- Potowatomi Forest Preserve
- Pounds Hollow Recreation Area
- Powderhorn Addition
- Powderhorn Prairie and Marsh Nature Preserve
- Powderhorn Prairie and Marsh Nature Preserve
- Powers Creek Conservation Area
- Powerton Lake State Fish and Wildlife Area
- Prairie Hills Wetland Preserve
- Prairie Oaks Forest Preserve
- Prairie Pothole
- Prairie Preserve on Belle Foret Drive
- Prairie Ridge Conservation Area
- Prairie Ridge State Natural Area
- Prairie State Eagle Refuge State Natural Area
- Prairie Wolf Forest Preserve
- Pratt’s Wayne Woods Forest Preserve
- Princess Mine Algific Slope
- Protected Grassland
- Pullman National Historical Park
- Purple Martin Sanctuary
- Pyramid State Recreation Area
- Quercus Woods Preserve
- R. Robert Funderburg Forest Preserve
- Raccon Lakes
- Raceway Woods Forest Preserve
- Racoon Grove Nature Reserve
- Rainbow Beach Dunes
- Rall Woods State Natural Area
- Ramsey Lake State Recreation Area
- Randolph County State Recreation Area
- Raven Glen Forest Preserve
- Ravine Park
- Ray Lake Forest Preserve
- Red Oak Nature Center
- Reddick Hollow NA
- Redwing Slough Forest Preserve
- Redwing Slough State Natural Area
- Reed Turner Woodland
- Reed Wildlife State Habitat Area
- Rend Lake State Fish and Wildlife Area
- Reservation Woods
- Revis Hill Prairie Nature Preserve
- Rice Algific Slope
- Rice Lake State Fish and Wildlife Area
- Richard Young Forest Preserve
- Richardson Wildlife Preserve
- Ridge Park Wetlands
- Ridgetop Hill Prairie Nature Preserve
- River Park Natural Area
- River Road Forest Preserve
- River Trail Nature Center
- Riverbend Forest Preserve
- Riverhill Nature Preserve
- Riverside Park
- Riverwood Forest Preserve
- Robert Allerton Park
- Robert Ridgeway Grasslands
- Robert Rutherford Wildlife Sanctuary
- Roberts Cemetery Savanna Nature Preserve
- Robeson Hills Nature Preserve
- Robinson Park South
- Robinson Woods - South
- Robinson Woods Preserve
- Rock Cut State Park
- Rock Island Trail
- Rock Springs Conservation Area
- Rockford Rotary County Forest Preserve
- Rockland Wetlands
- Rod and Gun Club
- Roland Olson County Forest Preserve
- Rolling Knolls
- Rollins Savanna Forest Preserve
- Roman Pucinski Preserve
- Romeoville Prairie County Forest Preserve
- Romeoville Prairie Nature Preserve
- Ronan Park Natural Area
- Ross Wildlife Area
- Route 137 Open Space
- Rubio Woods
- Rush Creek Conservation Area
- Russel Woods
- Rutland Forest Preserve
- Ryders Wood Park
- S.H. West County Park
- Sag Valley Forest Preserve
- Sagawau Canyon Nature Preserve
- Sahara Woods State Recreation Area
- Salamander Springs
- Saline County State Fish and Wildlife Area
- Salt Creek Greenway Forest Preserve
- Salt Creek Park Forest Preserve
- Salt Creek Woods
- Salt Lick Point Land and Water Reserve
- Sam Dale Lake State Fish and Wildlife Area
- Sam Parr State Fish and Wildlife Area
- Sand Creek Conservation Area
- Sand Prairie-Scrub Oak
- Sand Ridge Nature Preserve
- Sand Ridge Savanna Nature Preserve
- Sand Ridge State Forest
- Sandy Ford State Natural Area
- Sandy Hill Slough
- Sangamon Park
- Sangamon River Forest Preserve
- Sangamon River State Natural Area
- Sanganois State Fish and Wildlife Area
- Sannauk Forest Preserve
- Santa Fe Prairie
- Sauk Trail Forest Preserve
- Sauk Trail Reservoir
- Sauk Trail Woods
- Saw Wee Kee Park
- Schessler's Fen Forest Preserve
- Schiller Playfield
- Schiller Woods East
- Schiller Woods North Preserve
- Schiller Woods South
- Schiller Woods South Preserve
- Schiller Woods West
- Schurmeier Teaching Forest
- Schuth's Grove
- Schuth's Grove Preserve
- Schweitzer Woods Forest Preserve
- Searls Park Prairie Nature Reserve
- Seavey Ditch Restoration project
- Sedge Meadow Forest Preserve
- Seward Bluffs Forest Preserve
- Seymour Simon Preserve
- Shabbona Lake State Recreation Area
- Shanahan Grove Park
- Shannon Bayou
- Shawl Wildlife Preserve
- Shoal Creek Nature Conservation Area
- Shoe Factory Road Prairie Nature Preserve
- Shoe Factory Road Woods
- Shortline Railroad Prairie
- Shuh Shuh Gah Canoe Launch
- Sibley Grove Nature Preserve
- Sielbeck Forest State Natural Area
- Siloam Springs State Park
- Silver Creek Conservation Area
- Silver Creek Nature Area
- Silver Springs State Fish and Wildlife Area
- Simpson Township Barrens
- Simpson's Prairie
- Singing Hills Forest Preseve
- Singing Woods Nature Preserve
- Skokie Lagoons Central
- Skokie Lagoons North
- Skokie Lagoons South
- Skokie River Nature Preserve
- Skokie River Prairie Land and Water Reserve
- Skokie River Woods
- Sleepy Hollow Ravine Forest Preserve
- Smiths Park
- Snakeden Hollow State Fish and Wildlife Area
- Somme Prairie Grove Nature Preserve
- Somme Woods
- Sommer Farm
- Songbird Slough Forest Preserve
- South Barrington Conservancy
- South Hart Road Grassland Natural Area
- South Pond Natural Area
- South Shore Nature Sanctuary
- South Shore State Park
- Sparks Pond State Natural Area
- Spears Woods
- Spirit Trail Park
- Spitler Woods State Natural Area
- Spoon River State Forest
- Spring Bay Fen State Natural Area
- Spring Bluff Forest Preserve
- Spring Creek Preserve
- Spring Lake Forest Preserve
- Spring Lake Nature Preserve
- Spring Lake Preserve
- Spring Lake State Fish and Wildlife Area
- Spring Slough
- Spring Valley Nature Sanctuary
- Springbrook Prairie
- St. James Farm Preserve
- St. Paul Woods
- Starved Rock Nature Preserve
- Starved Rock State Park
- Stemler Cave Woods Nature Preserve
- Stephen A. Forbes State Recreation Area
- Stephen R. Keay Nature Learning Center
- Sterling Lake Forest Preserve
- Sterne's Fen Nature Preserve
- Steward Park
- Steward Pheasant Habitat Area
- Stickney Run Conservation Area
- Stidham Woods Forest Preserve
- Stillman Nature Center
- Stoney Ford Woods
- Stony Hills Nature Preserve
- Stubblefield Woodlots Nature Preserve
- Subat Forest Preserve
- Sugar River Alder Forest Preserve
- Sugar River Forest Preserve
- Sullivan Woods
- Sun Lake Forest Preserve
- Sundrop Prairie Nature Preserve
- Sunset Bridge Meadow
- Sunset Ridge Woods
- Surrey Lane Preserve
- Swallow Cliff Woods North
- Swallow Cliff Woods South
- Swayne Hollow SNA
- Sweeney Woods Preserve
- Sweet Woods
- Swift Prairie Forest Preserve
- T-Lake State Fish and Wildlife Area
- Tall Grass Prairie Recreation Area
- Tallmadge Sand Forest Land and Water Reserve
- Tampier Lake
- Tapley Woods Conservation Area
- Tekakwitha Woods Forest Preserve
- Thaddeus S. "Ted" Lechowicz Woods
- Thaddeus Stubblefield Grove Nature Preserve
- Thatcher Woods
- Thatcher Woods Preserve
- Thatcher Woods Trailside Meuseum of Natural History
- The Grove
- The Hollows Conservation Area
- The Prairie at Walnut Grove
- The Preserve of Highland Park
- Theodore Stone Forest Preserve
- Thirty-First Avenue Park
- Thistle Hills Land and Water Reserve
- Thomas Jefferson Woods Preserve
- Thomson - Fulton Sand Prairie Nature Preserve
- Thomson Prairie
- Thorn Creek Headwaters Preserve
- Thornton-Lansing Road Nature Preserve
- Timber Ridge Forest Preserve
- Tinley Creek Forest Preserve
- Tinley Creek Woods
- Tomlinson Pioneer Cemetery Prairie Nature Preserve
- Tower Lakes Fen Nature Preserve
- Tower Road
- Tower Road Boat Launch
- Trail of Tears State Forest
- Trail Woods Creek Natural Area
- Trails of Woods Creek Natural Area
- Trelease Prairie
- Trelease Woods
- Tryon Creek Woods
- Tucker Millington Fen Forest Preserve
- Turnbridge Wetland
- Turnbull Woods
- Turtle Wetlands
- Two Rivers Forest Preserve
- Two Rivers National Wildlife Refuge
- Tyler Creek Forest Preserve
- Ulrich Wildlife Preserve
- Union County State Fish and Wildlife Area
- Upper Embarras Woods Nature Preserve
- Uptown Natural Area
- Van Arnam's Island
- Van Horne Woods Forest Preserve
- Van Patten Woods Forest Preserve
- Vermont Cemetery Prairie Nature Preserve
- Veteran Woods County Forest Preserve
- Victoria State Habitat Area
- Virgil Forest Preserve
- Volo Bog State Natural Area
- Voyagers Landing Forest Preserve
- Waa Kee Sha Park
- Wadsworth Prairie Nature Preserve
- Wadsworth Savanna Forest Preserve
- Wagner Fen Nature Preserve
- Walden West Land and Water Reserve
- Walnut Creek Conservation Area
- Walnut Point State Park
- Walnut Point Wildlife Management Area
- Walter E. Heller Nature Preserve
- Wampum Lake
- Wanless Park
- Wapello Land & Water Reserve
- War Bluff Valley Sanctuary
- Warrenville Grove County Forest Preserve
- Waterfall Glen Forest Preserve
- Watersmeet Woods
- Waukarusa Canyon
- Waukegan Savanna Forest Preserve
- Wayne Fitzgerrell State Recreation Area
- Wayne Grove Forest Preserve
- Wayne Lehnert Preserve
- Wayside Woods
- Wayside Woods Preserve
- Weaver Park
- Webster Wildlife Site
- Weigh Station Prairie
- Weinberg-King State Park
- Weingart Rd Sedge Meadow Nature Preserve
- Weldon Springs State Park
- Wentworth Prairie
- Wentworth Woods
- Wes Block Trailhead
- West Branch Forest Preserve
- West Branch Forest Preserve
- West Chicago Prairie Forest Preserve
- West DuPage Woods Forest Preserve
- West Ridge Nature Preserve
- West Skokie Nature Preserve
- Westchester Woods
- Weston Cemetery Prairie Nature Preserve
- Whalon Lake Park
- Whistler Woods
- White Eagle Woods North
- White Eagle Woods South
- White Oak Woods
- White Pines Forest Nature Preserve
- White Pines Forest State Park
- Wigwam Hollow
- Wildlife Prairie Park
- Willam and E. Bohm Memorial Nature Preserve
- Willam C Drda Woods Nature Preserve
- Willoughby Farms Forest Preserve
- Willoughby Farms Forest Preserve
- Willow Creek Natural Area
- Willow Park
- Willow Springs Woods
- Willow Wood Park
- Willow-Sanders Preserve
- Willowbrook Forest Preserve
- Wilmette Park District
- Wilson Lot Bioretention
- Windfall Prairie Nature Preserve
- Winding Creek
- Windy Knoll Conservation Area
- Winfield Mounds Forest Preserve
- Wingate Prairie Nature Preserve
- Winnebago County Forest Preserve
- Winston Tunnel State Natural Area
- Witkowsky State Wildlife Area
- Wolf Creek State Park
- Wolf Lake Overlook
- Wolf Oak Woods Preserve
- Wolf Road Prairie Nature Preserve
- Wood Dale Grove Forest Preserve
- Wood Ridge Forest Preserve
- Wooded Island Natural Area
- Woodford State Fish and Wildlife Area
- Woodrow Wilson Woods
- Wymann Nature Preserve
- Yankee Woods
- Yonder Prairie
- Yorkville Prairie Nature Preserve
- Young Wildlife Preserve
- Zoo Woods